Marvel did a tag-team panel at Comic-Con this year for its two TV shows, Marvel's Agents of S.H.I.E.L.D. and Marvel's Agent Carter. SHIELD returns for its second season this fall while Agent Carter, based on Hayley Atwell's character from the Captain America films, will debut in the winter.

The panel featured the executives producers of both shows plus the stars, including Brett Dalton (Agent Ward) getting booed for wearing a "Hail HYDRA" shirt.

There wasn't much news on Agent Carter, other than lining up some top-notch directors for the show, while SHIELD unveiled some new casting bits, including more details on Lucy Lawless' character and the addition of a new superhero with ties to a member of the Avengers.

-Lucy Lawless will join the cast as Isabel Hartly, a long-time SHIELD agent who always has a knife at her side.

-Reed Diamond (Dollhouse, Franklin and Bash) will play Daniel Whitehall, a member of HYDRA and a villain early in season 2.

-British actor Nick Blood will play Lance Hunter, a member of S.T.R.I.K.E. (Special Tactical Reserve for International Key Emergencies), the U.K.'s version of SHIELD.

-A brief teaser for SHIELD season 2 was shown that included a reference to Bobbi Morse being in. Comic fans know her as the SHIELD agent and superhero known as Mockingbird. She is also romantically linked with Hawkeye (played by Jeremy Renner in the Avengers films).

-Agent Carter takes place in 1946 following the events of the first Captain America movie. It has not started shooting yet and still doesn't have a full cast.

-Anthony and Joe Russo, the directors of Captain America: The Winter Soldier, will come to TV to direct the second and third episodes of the new mid-season series Agent Carter.

Marvel's Agents of S.H.I.E.L.D. season 2 will premiere Tuesday, September 23 at 9pm on ABC and run for 10 episodes before taking a winter hiatus, at which time Marvel's Agent Carter will air.